Multiple File Format Support
As is the case with a majority of open source software, independent developers are constantly doing their best to make sure that GIMP is compatible with as many different file formats as possible. In addition to supporting most of the standard image file formats such as JPG, BMP, GIF, and TIFF, you can also open and edit PDFs, or even open Photoshop’s native format, PSD.
Essentially, GIMP has been created to be compatible with as many image files as possible so that you as a user never have to worry about not being able to work on an image or file. Whether you want to do basic photo enhancement or a little more advanced digital retouching to images, GIMP should be able to work with any format that you have the image in.
More impressive, perhaps, is the functionality that GIMP has built into it that allows you to save images and projects automatically as a compressed archive files in formats like ZIP, GZ, or BZ. This means you don’t have to go through the fuss of re-saving a file into a compressed format, and you don’t have to download file archiver software to help you save space if you edit a lot of pictures. Instead, GIMP does the work for you, and you can save your work to a compressed archive file with a single click.